The Nissan LD20 is a 1,973 cc, inline‑four naturally aspirated diesel engine produced between 1982 and 1993. It features a cast iron block and head, indirect injection via pre-combustion chambers, and a single overhead camshaft (SOHC). Output is modest, typically 48–55 kW (65–75 PS) and 125–135 Nm of torque, prioritising durability and fuel economy for light commercial vehicles.
Fitted to models such as the C22 Vanette, B11 Sunny Van, and A10 Vanette Cargo, the LD20 was engineered for reliable, low-cost operation in delivery and utility applications. Emissions compliance for its production period was met through mechanical fuel injection and basic exhaust aftertreatment, aligning with prevailing national standards of the 1980s.
One documented concern is premature failure of the mechanical fuel injection pump, particularly in high-mileage or poorly maintained examples, which can lead to hard starting and power loss. This issue, referenced in Nissan service documentation for the C22 platform, is often attributed to internal wear of the pump's precision components under sustained load.
Production years 1982–1993 predate standardized Euro emissions regulations. Compliance was managed under individual national vehicle standards applicable at time of manufacture.
The Nissan LD20 is a 1,973 cc inline‑four naturally aspirated diesel engine engineered for light commercial vehicles (1982-1993). It combines a robust cast iron construction with indirect injection to deliver dependable, economical performance. Designed for the emissions standards of its era, it prioritizes longevity and mechanical simplicity over peak output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,973 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 83.0 mm × 91.0 mm | |
| Power output | 48–55 kW (65–75 PS) | |
| Torque | 125–135 Nm @ 2,400 rpm | |
| Fuel system | Indirect injection (pre-combustion chamber), mechanical injection pump | |
| Emissions standard | Pre-Euro (National standards) | |
| Compression ratio | 21.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 15W-40 (API CC/CD) | |
| Dry weight | 165 kg |
The SOHC design offers mechanical simplicity and ease of maintenance but produces modest power by modern standards. Regular valve clearance checks (every 20,000 km) are essential to prevent noise and performance loss. The mechanical injection pump requires precise calibration; any signs of hard starting or smoke warrant immediate inspection. Using the correct high-detergent diesel oil helps manage soot and wear in the pre-combustion chambers.
Oil Specs: Requires SAE 15W-40 specification meeting API CC/CD (Nissan SM-LD20). Modern API CK-4 equivalents are recommended for improved protection.
Emissions: Pre-dates Euro standards; certified under national regulations (e.g., Japanese 1983 Emissions Law, UK pre-1992 standards).
Power Ratings: Measured under JIS D 1001 or DIN 70020 standards depending on market (Nissan Global Product Data 1985).
Nissan Service Manual (SM-LD20)
Nissan Technical Bulletin (TB-83-005)
Nissan EPC (LD20)
EU Regulation (EC) No 715/2007 (for historical emissions context)
The Nissan LD20 was used across Nissan's C22/B11 platforms with longitudinal or transverse mounting depending on application. This engine received platform-specific adaptations-different intake manifolds and ancillary layouts for the Vanette versus the Sunny Van. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the rear of the cylinder block, near the transmission bellhousing (Nissan SM-LD20). The 8th VIN digit often corresponds to the engine type for Nissan vehicles of this era. Visually, the LD20 can be identified by its single cam cover and prominent mechanical fuel injection pump mounted on the side of the engine block. Differentiate from the LD20T (turbo) by the absence of a turbocharger and associated plumbing. Service parts are generally consistent across applications but verify part numbers against the specific chassis code (C22, B11, A10) as ancillary components may differ.
The LD20's primary long-term reliability risk is mechanical fuel injection pump failure, with elevated incidence in high-mileage or neglected engines. While not subject to modern failure statistics, Nissan workshop data from the 1980s noted this as a common wear item. Infrequent maintenance and use of poor-quality fuel accelerate this wear, making regular service critical.
Analysis derived from Nissan technical bulletins (1982-1993) and historical workshop service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN LD20.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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